Question about Toshiba 40H80 40" Rear Projection Television

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No Picture - No Sound - Pilot lite OK - hear speakers 'blip' when turned on

No picture - no sound - pilot light OK.

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Re: No Picture - No Sound - Pilot lite OK - hear speakers...

Toshiba did have a problem with a protection ic that would fail. It is possible that this is the problem. But some trouble shooting will need to be done buy a repair shop.

Posted on May 26, 2008

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The sound on my tv is just clicking

First, try to connect ext speakers. If the sound is OK just replace speakers. Otherwise the problem in amped sound output.

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This could be a problem in the vertical sweep circuit, as when the vertical circuit fails, The video or screen will blank out so the picture tubes do not get damaged. In this chassis, I have seen the convergence IC's cause this, or the capacitor in the sweep power supply that feeds the voltage to the vertical IC has failed and blew out the vertical output IC. If you have no solid state repair experience, play it safe and call in a trained tech to assist you in this repair. Good Luck.

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I would check the fuse on the main board. Check the Capacitors on the Power Supply board. Seeing that you unplugged it and replugged it in you might have bad caps that were weak to begin with. Please learn how to safely work on a TV before attempting . Even when a tv is unplugged it has enough power to kill you. Discharge all Capacitors first. make sure its unplugged of course.

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This could be a number of things. Your lamp could be bad or it needs to be reseated to the ballast. The lamp is trying to light and it will make the ballast flicker (that is the clicking sound) or your ballast is bad and it needs replaced (it will flicker and click too). Or your color wheel is broken and it will make a clicking sound when turning. If the color wheel is not spinning or broken it will not light the lamp. No lamp no picture.

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No picture or sound

This symptons is usually caused by a breakdown in the power supply. it may also be caused by a breakdown in the horizontal deflection circuits(hor. oscillator, pre drive or drive ckts.). this because the supplu voltages from tuner, video intermediate frequency (vif), video amplifier, sound intermediate frequency(sif), and vertical output are usually supplied by horizontal output circuit. switch on the receiver and check whether the pilot lamp is on, or the filament of the crt is glowing. if not, possible short circuit before the rectifier circuit such as fuse, power cord or switch. if the pilot lamp is on or the filament of the crt is glowing, check the b+ supply voltage for the horizontal deflection circuit. if the b+ voltage is zero or very low, check the rectifier circuit and the voltage regulator circuits. if b+ is nrmal, troubleshoot the horizontal deflection circuits.

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